Additional file 2.

Low magnification SEM images of a typical gold nanoparticle array and porous silicon samples fabricated by metal-assisted etching. SEM images of a typical gold nanoparticle array and porous silicon samples which have been prepared by metal-assisted etching. The etching masks were fabricated using different methods. The insets show the corresponding FFTs. (a) gold nanoparticle array, (b) piranha solution/plasma treatment, (c) piranha solution/flame annealing, and (d) HF/flame annealing. (DOC 14557 kb)

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Scheeler et al. Nanoscale Research Letters 2012 7:450   doi:10.1186/1556-276X-7-450